Granted Patent
Utility
US 4,920,813 · App. 07/196,918
Power take-off control apparatus
Inventor:
George A. Willford
Patented Case
View Patent ↗
Granted: May 1, 1990
Filed: May 20, 1988
Inventor
George A. Willford
Assignee (at issue)
DANA LIMITED
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.